2
votes
0answers
48 views

Why did the Chinese put the Tiangong-2 so high?

The most obvious answer is that they don’t want to deorbit the station shortly, but why? Some calculations with the TLEs and SGP4 show the following Tiangong-2 / ISS close encounters: ...
1
vote
1answer
36 views

With what speed goes Phobos in the direction of Mars with a constant force in that direction?

Edit: Although this question may look similar to this one, here I am asking about a constant force in the direction of Mars, and no one of the answers there have answered this question. Because ...
0
votes
0answers
20 views

International Space Station consumables shelf life duration

Most of ISS crew consumables are designed for a long store period. I couldn't find any info - what are shelf life durations for the consumables? What are typical shelf life in ISS storage for: ...
1
vote
1answer
25 views

What is the eccentricity of a near equatorial LEO?

I am trying to do some calculation on the 2-body problem but I am stuck as I need either the eccentricity or the periapsis of the orbit. I already have the orbital period which I assume as ~127 min as ...
2
votes
0answers
31 views

Apollo Lunar Module *Interior* | What colors were used and why?

There are lots of publications and blog posts on the exterior colors of the Apollo Lunar Module (a function of material choices), but I've struggled to find any information on the interior colors and ...
1
vote
2answers
39 views

What is the daytime ambient temperature on the moon in shade?

I know that the daytime surface temperature can exceed 270 degrees but if you measured the temperature 5 feet off the surface in shade what would the reading be?
0
votes
0answers
6 views

Can Lissajous orbits have stable/unstable manifolds?

The question Did DSCOVR travel “along the stable manifold of it's future SE L1 Halo orbit” to get there? is specific to DSCOVR's trajectory from Earth to its primarily heliocentric orbit near Sun-...
2
votes
1answer
42 views

Does deploying the parachute dehermetize Soyuz?

When watching the Year in Orbit documentary, one of cosmonauts points to the big bags stowed between/above the seats of Soyuz capsule, identifying them as the main and emergency parachutes. But they ...
1
vote
1answer
33 views

Low arrival V-infinity?

So I am modelling an Earth - Mars low thrust trajectory in a simple manner. I'm telling my model to not model any trajectories where the spacecraft is moving any more than 200 m/s quicker or slower ...
15
votes
2answers
807 views

How was “Space Ram” (instant ramen noodles) prepared and eaten on the Space Shuttle?

The BBC Witness Podcast The Invention of Instant Noodles mentions that "Space Ram" (ramen noodles for space) was developed for eating on the Space Shuttle. After about ...
1
vote
0answers
19 views

Will Astrobee be the second time that an autonomous, mobile robot will use ROS?

The question ROS is running on the Robonaut, but is the Robonaut running on the ISS (post 2015)? asks about Robot Operating System or ROS. In the Art Technica video Talking Space and Robots with NASA'...
7
votes
2answers
208 views

Worst damage incurred during a rendevouz or docking operation?

Has there been any damage incurred during a rendevouz of two spacecraft? I was reading the answer to this question and starting realizing the sheer number of things that could still go wrong even if ...
1
vote
0answers
22 views

Parker Solar Probe Launch - Burning Flame [duplicate]

When watching the live launch of the NASA Parker Solar Probe, I noticed that there was a burning flame near the launch site (bottom left in the image) My intuition tells me that it's hydrogen that's ...
1
vote
0answers
47 views

Artificial Magnetosphere to Terra-form Mars?

I was reading this article on a potential theory of how we could terraform Mars using a magneto-tail. This would basically entail sticking a giant magnet that carried a charge between 10,000 and 20,...
24
votes
2answers
4k views

Why didn’t the Spacecraft used for the Apollo 11 mission melt in the Earth’s Atmosphere?

My brother has recently been converted to a Flat Earther and is convinced that something that proves his theory is the moon landings being faked by NASA. I have managed to counter argue the majority ...
4
votes
0answers
31 views

Does NOAA still plan to deploy all twelve Cosmic-2 GPS radio occultation satellites?

In the 2014 Space News interview of Jim Bridenstine (now NASA administrator, then member of the US house of representatives for Oklahoma) Q&A With Rep. Jim Bridenstine (R-Okla.) appears: Space ...
4
votes
0answers
45 views

How will the Lunar Gateway go to L2 and L1?

In a talk to the press which can be heard in the YouTube video NASA Administrator Jim Bridenstine Explains the Lunar Gateway, NASA director Jim Bridenstine says after about ...
0
votes
0answers
73 views

Will Japan's Interstellar Technologies really call its rocket a “Zero”?

The Space News article Japan’s Interstellar Technologies goes full throttle toward small orbital rocket says: LOGAN, Utah — Japanese startup Interstellar Technologies is developing the main engine ...
5
votes
2answers
140 views

Why is the US building a Lunar Orbital Platform-Gateway (LOP-G)?

An excerpt taken from the Wikipedia page on LOP-G says space-experts have criticized it: The Deep Space Gateway has received criticisms [...] for lacking a proper scientific goal. Former ...
40
votes
2answers
11k views

Is pinging the Moon with a laser as shown on “The Big Bang Theory” possible?

In an episode of season 3 of The Big Bang Theory, the cast sends a laser pulse to the Moon. This seems to be a real thing: What Neil & Buzz left on the Moon (2004). My questions are: Could ...
1
vote
1answer
112 views

How open is NASA's “open source” GMAT software?

In answers and comments to What does it mean when a software is called open-source for US-release only? I found out that when NASA uses the term "open source" it does not mean open to everyone! ...
4
votes
1answer
75 views

How will Icarus aboard the ISS track bird migration?

The question Is it possible to see animals from space? has several answers, and they are all based on optical imaging. In this answer I describe and show images from the First count of individual ...
4
votes
1answer
83 views

How to determine an orbit of a satellite for a collision detection?

I'm trying to validate an collision detector , and for that I'm starting from a pair of initial conditions for a satellite.After that I will use an RK method to integrate . How can I determine a pair ...
8
votes
3answers
163 views

Have we considered sending people on no-return missions?

This question is more about morals and philosophy and is a rather dark one. Anyway, has it been considered and/or is it a viable idea to send an astronaut to another planet to die, or is it ...
13
votes
1answer
488 views

How is a Russian satellite's behavior “very abnormal”?

The BBC has a news article saying: "Mystery Russian satellite's behaviour raises alarm in US". But the article doesn't say how or why the behavior is "abnormal". And the linked transcript of Remarks ...
15
votes
3answers
2k views

What would be necessary in order for us to achieve a single stage to orbit, reusable rocket?

I have read articles and seen videos explaining why an SSTO (Single Stage To Orbit) rocket* is not possible. But I was wondering... What would be required to achieve this? Answers can be literally ...
5
votes
1answer
94 views

Relativistic effect on satellite motion

I am using GMAT to propagate satellite motion. At first, I excluded all the propagators besides harmonics(of second degree and 0th order, as shown in the picture): Here are the results(...
2
votes
0answers
85 views

What is the timespan for a block from Phobos to reach a low orbit around Mars with a solar sail?

Edit: Although this question is marked as a duplicate of this one about solar sail thrust calculation, they are different because I ask about a solar sail that has an orbital trajectory and will have ...
3
votes
1answer
53 views

Earth-based lightning on the Space Station channel

When watching the NASA channel (such as on YouTube) you see clouds and occasionally land forms. Why is it we never see electric storms on Earth ?
0
votes
0answers
22 views

Which 3D printing technology will Archinaut vessel use?

The 3D printing company Made in Space works on a device to introduce 3D printing in space referenced as Archinaut. Is it known which technology/material will be used?
-2
votes
0answers
90 views

In what way(s) is OD (Orbit Determination) “an art”? [on hold]

A recent comment includes the following: As my professor of OD would say "orbital determination is more of an art than a science." and was also referenced in chat: But OD is really an art, as ...
3
votes
2answers
65 views

Onboard propagator in satellites SGP or J2

The Earth orbit propagator SGP4 (simplified general perturbation) was developed by NORAD to allow users to generate short-term prediction of satellite positions using two line element sets (TLEs) ...
1
vote
1answer
74 views

Would a nuclear explosion over one of the Earth’s magnetic poles momentarily disrupt/weaken the Earth’s magnetic field? [on hold]

If say the Tsar Bomba had been detonated directly over one of the Earth’s magnetic poles at ground level, would the nuclear electromagnetic pulse generated from that blast have had any momentary ...
1
vote
2answers
109 views

Modern ICBMs vs new Russia Weapons [on hold]

If a modern ICBM can travel at speeds of 6-7 km/s (around 25000 km/h) and the speed of sound is 1192 km/h that's by my math Mach 21. So if a modern ICBM can travel at Mach 21, why are new hypersonic ...
3
votes
0answers
97 views

Do we have a photo of a micrometeorite impact on a lens?

Micrometeorite and debris impacts on orbital spacecraft pose a threat to systems and crew. For example, a high velocity impact caused this chip in the International Space Station's Cupola. The ISS ...
25
votes
1answer
4k views

Would this chair support astronaut during launch in Crew Dragon

Recently reporters were allowed to take pictures of Crew Dragon and the SpaceX flight suit. Among them is this picture: I was under the impression that: Chairs needed to be custom molded / adjusted ...
3
votes
0answers
53 views

Which is the best glass for shielding against radiations and impacts? [on hold]

Which glass should be used for overcoming radiation and orbital debris? I have seen about monolithic glass and acrylic glass, which can be used for this purpose. Are there any others type which can ...
2
votes
2answers
112 views

G - forces imparted by launchers

How can one know the G forces imparted from the technical data presented on the websites of launch vehicles? I am interested in finding a way to theorise the max G-forces imparted by researching ...
3
votes
1answer
114 views

Relation between GOCE gravity model and Earth shape

There are a couple of viral videos claiming that "NASA shows that Earth is shaped like potato". The source of such videos is 3D visualization of data collected by GOCE satellite (full animation, video ...
19
votes
1answer
3k views

Has the Earth's red atmosphere rim ever been photographed?

In the Wikipedia article on Lunar eclipse there's given an image of how the Earth would look from the eclipsed Moon: This is obviously a schematic drawing. So I wonder, has the Earth ever been ...
4
votes
1answer
170 views

Parker Solar probe's heat survival - Heat vs Temperature

This is not about about heat shields, materials, coolant, etc. I am not quite not getting the science that explains the Heat Vs Temperature, which is how the Parker probe is going to survive the ...
5
votes
2answers
2k views

What kind of antimatter engine is this?

I found this diagram while looking up diamagnetic machines. Could anyone explain what engine this is?
1
vote
0answers
33 views

Would a diamagnetic solar sail sail faster?

Instead of using a standard solar sail material could the sail be built of diamagnetic material and sail faster?
1
vote
2answers
40 views

Can the Sun's magnetic field be used to propel a solar satellite?

Can diamagnetic materials or a diamagnetic devise be used to propel using the magnetic field of the Sun in a solar polar magnetic assisted slingshot?
3
votes
1answer
68 views

What effects does atmosphere have on solar panels?

For the purpose of this question I do not want to focus simply on the fact that there will be less "night time" for the panels while in orbit/outside the atmosphere of a planet. What I'd like to ...
2
votes
1answer
111 views

3D metal printer in microgravity possible?

After reading on regarding in situ manufacturing in space, I've found out there is already a 3D printer for plastic on ISS, and the company behind it works on a space craft to manufacture larger (...
2
votes
1answer
58 views

Beyond the Apollo 12 incident, have there been any instances of triggered lightning?

As explained in this answer, the ionised plumes of engine exhausts can provide a low-resistance route for lightning strikes during a launch, potentially endangering the vehicle. This is thought to ...
11
votes
1answer
468 views

Design of 1970s era orbital fuel depot

Multiple concept art examples for a 1970s orbital fuel depot from Marshall Space Flight Center show cylindrical tanks perpendicular to a central core. But then at one end of the central core are ...
5
votes
2answers
241 views

Aerodynamically - can a rocket be over 30 meters in diameter?

The past and current designs of rocket launchers have diameters up to 8-10 meters (Saturn-5, N-1, SLS, BFR), up to 13-14 meters for max cross-section dimension for Space Shuttle and Energia-Buran (...
7
votes
1answer
68 views

Evidence of Water D/H Ratios of Kuiper Belt Comets

I was wondering, are the comets 67P/Churyumov-Gerasimenko and 103P/Hartley 2 the only Kuiper Belt comets to date that have their water D/H ratio measured? I have read that water D/H ratio of 67P/...

15 30 50 per page